package com.example.framework.config.token;

import com.example.project.entity.UserInfoBean;
import com.example.project.service.UserService;
import com.example.utils.redis.RedisUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

/**
 * 拦截器
 * 获取token并验证token
 */
public class AuthenticationInterceptor implements HandlerInterceptor {

    @Autowired
    UserService userService;

    @Autowired
    public RedisUtils redisCache;

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object) throws Exception {
        String token = httpServletRequest.getHeader("Authorization");// 从 http 请求头中取出 token
        // 如果不是映射到方法直接通过
        if (!(object instanceof HandlerMethod)) {
            return true;
        }
        HandlerMethod handlerMethod = (HandlerMethod) object;
        Method method = handlerMethod.getMethod();
        //检查是否有passtoken注释，有则跳过认证   (使用@PassToken注解)
        if (method.isAnnotationPresent(PassToken.class)) {
            PassToken passToken = method.getAnnotation(PassToken.class);
            if (passToken.required()) {
                return true;
            }
        }
        //检查有没有需要用户权限的注解  (使用@LoginRequired注解)
        if (method.isAnnotationPresent(UserLoginToken.class)) {
            UserLoginToken userLoginToken = method.getAnnotation(UserLoginToken.class);
            if (userLoginToken.required()) {
                // 执行认证
                if (token == null) {
                    throw new RuntimeException("无token，请重新登录");
                }else{
                    // 获取 token 中的 user id
                    UserInfoBean userInfo = (UserInfoBean)redisCache.get(token);
                    if (userInfo == null) {//失效  去登录
                        throw new RuntimeException("用户不存在，请重新登录");
                    }else{
                        //刷新 redis的token
                        redisCache.set("bearer "+token, userInfo);
                        redisCache.expire(token, 60*10);
                    }
                    //将验证通过后的用户信息放到请求中
                    httpServletRequest.setAttribute("currentUser", userInfo);
                    return true;
                }
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest,
                           HttpServletResponse httpServletResponse,
                           Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest,
                                HttpServletResponse httpServletResponse,
                                Object o, Exception e) throws Exception {
    }
}